[Bug 754680] fix support for EGL through GstVideoGLTextureUploadMeta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754680

--- Comment #31 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 338671
  --> https://bugzilla.gnome.org/attachment.cgi?id=338671&action=edit
vaapidisplay: refactor the current design by using new  GstVaapiDisplayGLIface

Cut the relation between GstVaapi(native)Display and GstVaapiDisplayGLX/EGL.
Then GstVaapiDisplayGLX/EGL use new GstVapiDisplayGLIface and
implements specific operation on its own platform.

So gst-vaapi elements could create vaapi display for native
display(X11/Wayland) first, then bind GL stuff once gl context is found.

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